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Compare DNS responses in real time across available probes on different networks and regions.

Check if all global servers return this exact IP or value.

Frequently Asked Questions about DNS & Propagation

Root cause analysis, technical diagnosis and official resolution guides from Anayil Knowledge Base.

Explore all DNS troubleshooting articles in Anayil
1

What is DNS propagation and why is it not instantaneous?

DNS propagation is the synchronization window where recursive resolvers, ISPs, and local caches worldwide update their stored answers with the new zone records.

Why does this happen?: Intermediate DNS resolvers cache query responses locally to save upstream bandwidth and reduce round-trip query time.
How to resolve it?: Use this Global DNS Checker to track continental propagation progress before declaring a server migration complete.
Guide [DNS-005]: Website retains previous DNS address
2

Why does propagation take from minutes up to 24–48 hours?

Total propagation time depends on the TTL (Time To Live) value configured on the record and whether ISP resolvers enforce their own minimum cache windows.

Why does this happen?: If a record had an 86400s (24h) TTL before modification, external resolvers will keep returning the cached IP until the timer runs out.
How to resolve it?: Reduce the TTL to 300 seconds (5 min) 24 to 48 hours before the change. On local machines, flush the OS resolver cache (`ipconfig /flushdns`).
Guide [DNS-016]: TTL delays verification of a DNS change
3

How to speed up DNS propagation during a migration without downtime?

Zero-downtime migrations require a two-phase plan: pre-migration TTL reduction and dual-server synchronization.

Why does this happen?: Changing records with high TTLs sends half of global traffic to the new server while the rest keeps hitting the old server.
How to resolve it?: 1) Drop TTL to 300s two days ahead. 2) Keep both server environments in sync. 3) Update the records. 4) Restore TTL to 3600s after full verification.
Guide: Prepare a DNS destination change for a website
4

What is the purpose of each record type (A, AAAA, MX, CNAME, TXT)?

Each record has a specialized function: A points to IPv4, AAAA to IPv6, CNAME creates hostname aliases, MX routes email and TXT hosts SPF/DKIM/DMARC.

Why does this happen?: Setting a CNAME on the zone apex (@) or colliding A and CNAME records on the same hostname causes RFC violations and resolution drops.
How to resolve it?: Use A/AAAA for direct destination IPs, CNAME only on subdomains, and properly formatted TXT records to prevent email deliverability failures.
Guide: Review and change records in a DNS zone